Using Terminal.app, try the simple instructions given at the following web-site:

http://www.twentyways.com/2009/02/07/permanently-disable-google-software-update-on-os-x/

I find it works like a charm, and GoogleSoftwareUpdate & friends are no longer restored when you install new Google things. If you really want to get Updates, you can run GoogleSoftwareUpdate yourself.

In Terminal.app, issue this command:

sudo /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/MacOS/GoogleSoftwareUpdateDaemon -onDemand YES >/dev/null 2>&1 &

That is one long line composed of seven blank-separated parts:

sudo
/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/MacOS/GoogleSoftwareUpdateDaemon
-onDemand
YES
>/dev/null
2>&1
&

The /Library…Daemon portion is the longest part. The ” &” at the end says to run in the background, which frees up your Terminal.app session. You can “Quit” from GoogleSoftwareUpdate using the Activity Monitor (Administrative Processes). Just select the GoogleSoftwareUpdate line and click the “Quit” button on the upper left of the Activity Monitor window.